[(no branch, rebasing trofi/dhcp-master)] dhcp/bind: build bind1->atf->bind2 sequentially

[(no branch, rebasing trofi/dhcp-master)] dhcp/bind: build bind1->atf->bind2 sequentially

All 3 steps are interdependent:
- bind1 unpacks bind source
- atf builds tests in it
- bind2 builds bind

Without the dependencies parallel build on -j16 fails as:

    $ make -j16 -l16
    Making all in ./bind
    make[1]: Entering directory '/build/dhcp-4.4.2-P1/bind'
    Building BIND libraries - this takes some time.
    bash: line 6: cd: /build/dhcp-4.4.2-P1/bind/bind-9.11.14/lib/isc: No such file or directory
    Building isc library in /build/dhcp-4.4.2-P1/bind
    bash: line 6: cd: /build/dhcp-4.4.2-P1/bind/bind-9.11.14/lib/isc: No such file or directory
    bash: ./configure: /bin/sh: bad interpreter: Text file busy
    make[2]: *** [Makefile:42: bind1] Error 126
    make[2]: *** Waiting for unfinished jobs....